#include <stdio.h>
#define MAX 100
#define HELLO "Hello, world"
#define OW "C programming language is invented \ in 1970s."
#define TWO 2
#define FOUR TWO *TWO
#define FOO hello
int main()
{
    // 打印 HELLO 的宏地址;
    printf("%d\n", HELLO);
    // 输出 TWO
    printf("TWO\n");
    return 0;
}